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The people of Ferguson, Missouri, held several events this weekend to mark the second anniversary of the death of Michael Brown. The 18-year-old was shot and killed by former Ferguson police officer Darren Wilson on August 9th, 2014. The annual Michael Brown Justice Walk was held Saturday, led by Brown's father Michael Brown Sr. The walk for justice started at the spot where his son died and ended at his high school. (Published Tuesday, Aug. 9, 2016)

Gunfire broke out during a demonstration in Ferguson, Missouri, on the second anniversary of Michael Brown's death, disrupting what had been a peaceful gathering Tuesday night but apparently wounding no one.

Witnesses told an Associated Press reporter that a car sped through a group of protesters who were blocking a street during the demonstration marking two years since the unarmed black 18-year-old's fatal shooting by a white police officer. They said the car struck a young man so hard that he flew into the air. As the car drove away, shots were fired, they said.

Protests Erupt After Ferguson Decision

Police responded to reports of gunfire but had found no evidence that anyone had been struck, said Ferguson spokesman Jeff Small, who declined to speculate about why the shots were fired.

Earlier in the day, a few hundred people gathered for a memorial service and moment of silence along Canfield Drive at the spot where Brown was fatally shot by officer Darren Wilson after a confrontation on Aug. 9, 2014.

One Year Ago: Images from Ferguson, Missouri

A state grand jury declined to press charges against Wilson, and the U.S. Justice Department later cleared him, concluding that he had acted in self-defense. He resigned in November 2014.

Brown's death led to months of sometimes-violent protests in Ferguson. It was also was a catalyst for the Black Lives Matter movement, which rebukes police treatment of minorities and has grown following several other killings of black men and boys by police, such as Tamir Rice in Cleveland and Philando Castile in Minnesota.

Brown's father, also named Michael Brown, said in a brief speech during the memorial service that the anniversary was a sad day for him and his family, and for the world, too.

"My son built families up, opened the eyes of the world and let them know this ain't right," he said. "This color is not a disease. This color is beautiful. Black is beautiful."

The 2014 shooting also led to a Justice Department investigation that found patterns of racial bias in Ferguson's police and municipal court system. The federal agency and the city agreed this year to make sweeping changes.

This month, more than 60 organizations affiliated with the Black Lives Matter movement released a list of six demands and 40 recommendations for how to achieve policing and criminal justice reforms.